(function (tree) {

tree.Directive = function (name, value, rules, index, currentFileInfo, debugInfo) {

this.name  = name;
this.value = value;
if (rules) {
    this.rules = rules;
    this.rules.allowImports = true;
}
this.index = index;
this.currentFileInfo = currentFileInfo;
this.debugInfo = debugInfo;

};

tree.Directive.prototype = {

type: "Directive",
accept: function (visitor) {
    var value = this.value, rules = this.rules;
    if (rules) {
        rules = visitor.visit(rules);
    }
    if (value) {
        value = visitor.visit(value);
    }
},
genCSS: function (env, output) {
    var value = this.value, rules = this.rules;
    output.add(this.name, this.currentFileInfo, this.index);
    if (value) {
        output.add(' ');
        value.genCSS(env, output);
    }
    if (rules) {
        tree.outputRuleset(env, output, [rules]);
    } else {
        output.add(';');
    }
},
toCSS: tree.toCSS,
eval: function (env) {
    var value = this.value, rules = this.rules;
    if (value) {
        value = value.eval(env);
    }
    if (rules) {
        rules = rules.eval(env);
        rules.root = true;
    }
    return new(tree.Directive)(this.name, value, rules,
        this.index, this.currentFileInfo, this.debugInfo);
},
variable: function (name) { if (this.rules) return tree.Ruleset.prototype.variable.call(this.rules, name); },
find: function () { if (this.rules) return tree.Ruleset.prototype.find.apply(this.rules, arguments); },
rulesets: function () { if (this.rules) return tree.Ruleset.prototype.rulesets.apply(this.rules); },
markReferenced: function () {
    var i, rules;
    this.isReferenced = true;
    if (this.rules) {
        rules = this.rules.rules;
        for (i = 0; i < rules.length; i++) {
            if (rules[i].markReferenced) {
                rules[i].markReferenced();
            }
        }
    }
}

};

})(require(‘../tree’));